The Heating/Cooling Curve of a Pure Substance

    So basically what we did today is the heating and cooling curve of a pure substance, we also needed to do a flow chart because we might have a lab next class.

   So A is a solid state at any temperature below melting point; A-B turns heat energy to kinetic energy; B is the point where it starts to melt or be frozen; B-C exists in both solid and liquid state and the temperature remains constant, it is also the melting point; C is completed melted and it transformed from solid to liquid; C-D is a liquid state and it gains more energy while heated, besides, the temperatures continues to increase; D is still in liquid state, the molecules received enough energy to overcome force of attraction between particles in the liquid, and the liquid begins to turn to gas; D-E exists in both liquid and gaseous states while the temperature remains unchanged, heat energy is also absorbed to overcome intermolecular forces, it is also the boiling point; while we reached E, all liquid turned to gases; Last but not least, E-F, gas particle keep absorbing to move faster.

 

 After reading the textbook from pages 25-34, I discovered something interesting. Most useful ideas are simple in theory, but complicated in practice. I also learned a lot of stuff about what a chemist is specialized, the use of water, what is a mixture, solution, and what is distillation, I have learned about that but after studying this it recalled my memory about this. I also read about a complicated process called electrolysis.

Matter is Made of AtomsAs we know that, matter is everything around us. We can made observations by viewing, such as smelling or feeling are called macroscopic observation to recongnize different matter. Also, by mesuring the melting point, boiling point, heat of fusion, temperature and mass are called macroscopic properties. And we can use microscopic model to explain the behavior of matter in a micro (small) unit.

Atom means this smallest possible piece of something. Elements are pure substances that cannot be broken down, and it presumes that every element contains only one type of atom. Molecules are the particles that made of more than one atom. Compounds are made by combining elements in definite proportions